PCBS 30 November, 1999
2-40
Modem (Rockwell R288F)
•
V.21, V.27ter, V.29, V.17, V.33 (Ricoh mode only), and V.34 modems
GEPC
•
Power pack and main motor control
Oscillators
•
29.952 MHz oscillator for system, scanner and printer clock generation
•
32.768 MHz oscillator for the real time clock. The battery on the FCU backs
this up
•
56.448 MHz oscillator for the R288F modem clock
•
4.19 MHz oscillator for the DTMF receiver clock
•
8.00 MHz oscillator for the Energy Saver CPU clock
•
8.00 MHz oscillator for the GEPC clock
EXIO (External I/O)
•
Serial interface to the operation panel and optional paper feed units
•
Parallel interface to the motors, clutches, sensors, and other electrical
components
Switch
Item Description
SW1 Switches the backup battery on/off
Energy Saver CPU
•
4-bit CPU for controlling the machine during energy saver mode.
Analog circuit with HIC (AFE – Analog Front End)
•
2-4 wire switching
•
Filters and amplifiers
•
Monitor speaker driver
DC/DC Converters
•
+5V, +12V, and -9V generation
DRAM Backup
•
+5VD generation for DRAM (SAF memory) backup
The FCU (Facsimile Control Unit) board contains the FCIP2 (Facsimile Control and
Image Processor), DRAM, SRAM, Flash ROM, and video processing memory, and
it controls the entire system.
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